Elbow lathe



- H. PARKER ELBOW LATHE July 7, 1931.

Filed March 12, 1929 4 Sheets-Sheet l July 7, 1931. PARKER 1,813,419

E BOW LATHE Filed March 12. 1929 4 Sheets-Sheet 2 fllllllll lllllll H.PARKER 1,813,419

ELBOW LATHE Filed March 12 1929 '4 Sheets-Sheet 3 H. PARKER ELBOW LATHEJuly 7, 1931.

Filed March 12 1929 4 Sheets-Sheet 4 1 2 (%/%m 47 kw Patented July 7,1931 UNITED STATESQPAFTENT- OFFICE HOWARD PARKER, OF BERLIN, NEWHAMPSHIRE, ASSIGNOR T30 BROWN COMPANY, OF

I BERLIN, NEW HAMPSHIRE, A CORPORATION OF MAINE ELBOW LATHE Applicationfiled March 12, 1929. Serial No. 346,478.

This invention relates to mechanism for truing the ends of pipe elbowsand shaping these ends to fit a threaded, tapered, or other kind ofcoupling, as desired. The apparatus ll hereinafter described is moreespecially intended for use in operating on elbows of fiber tubing orconduit such for example as is made by winding up a web of wetcellulosic fiber ona mandrel until the desired wall thickness isobtained, then removing the tube thus formed from the mandrel, anddrying the tube. The dried tube may then be treated with a waterproofingcompound such as pitch, this resulting in a tube which is relativelylight in weight, but strong. The ends of the tube sections may bemachined toreccive corresponding couplings. Some of the tube sections maybe bent, while wet,

I into elbows of various angles. In machining the ends of an elbow toreceive; couplings, it is important that the en dsbe properly alignedwith the adjoining conduit sections to avoid undue stresses at thejoints. To this end I provide a pair of end-trimming mechanisms carriedby a supporting frame so as to operate about axes which bear a definiteangular relation to each other. Suitable means for supporting an elbowfor trimming may also be carried by the frame.

Various additional advantageous features of structure will be apparentto one skilled in the art from the description of the invention whichfollows hereinafter, and from the drawings, of which,-

Fi 'ure 1 is a plan view of mechanism emb bodying the invention. 1

Figure 2 is a side elevation of the same. Figure 3 is an elevationof aportion of the mechanism from a different direction.

Figure 4; is a section on line 1-4 of Figure 3. v

Figure 5 is a section on line 55 of Figure 6. i

Figure 6 is a section on line 66 of Figure 5.

Figure gearing. g

Figure 8 isa PltLIl VlQW of transmlsslon gearing for driving one of thecutter heads. Figure 9 is a'sideelevation of the same.

7 is a sectional view of adjustment Figure 10 is a section on line.101() of Figure 8.

Figure Figure 8.

Figure 12 is a fragmentary section of a mechanism controlling thereversing and stopping of cutter heads.

Figure 13 is a section on Figure 12.

Figure 14 is an end elevation of a cutter head for operating on theexterior surface of a tube.

Figure 15 is a side elevation of the same, a portion being shown insection.

Figure 16 is an end elevation of a cutter head for operating on theexterior surface of a tube.

Figure 17 is a side elevation of the same.

Referring to thedrawings in detail, 20 represents a bed having thegeneral shape of a quadrant. At one side of this quadrant is anextension 21 of the bed on which is mounted a frame 22. Atthe other endof the bed 20 is a secondframe 23 which is carried by an arm 24 pivotedas at 25, this pivot being at the center of the quadrant formed by thebed 20. The frames 22 and 23,.as shownin Figure 1, may be arranged sothat their long axes are perpendicular to one another. The frame 23,however, can'be swung. on the pivot 25 so that the axes of the framesmay be adjusted to any angle from 90 to 180. 7

On the frame 22 may be mounted a cutter head 26, a similar cutter head27 being mounted on the frame 23. These cutter heads may be driven inany desired manner; As shown on the drawings, the cutterhead 26 isrotated as by an electric motor 28,'a similar motor 29 being provided todrive the cutter head 27. The cutter heads 26 and 27 are preferably somounted that their axes of operation are respectively parallel to theaxes of the frames 22 and 23.

In order to provide for quick movement of the cutter heads along theiraxes toward and from the work, each cutter head together 11 is a sectionon line 1111 of line 13-43 of with its driving mechanism may be mountedon a longitudinal slide 30, which is provided witha rack 31 and may becontrolled as by a suitable hand wheel 32. The cutter heads are eachadjustable in'a horizontal plane to operate on elbows of differentlengths. To this end the slide 30, as shown, is slidably supported by atransverse slide 33 which slides transversely on a standard 34, thestandard 34 in turn being adjustable longitudinally on the. franre 22.Thepositions otthe slides and be adjusted as by atra nsverse screwthreaded member 35 and a longitudinal screw threaded member 3.6. Thescrew 3.5 is carried by the slide 34 andengages an internally threadedlug 37 which is carried by the slide so that rotation of the screw 35motes the slide 33 laterally of the frame 22. In like manner the screw36 is carried by the franie 22' and engages an internally threaded lugcarried by the standard 34 so that rotation of the screw 36 results inlongitudinal adj usting movement of the standard 34 and the mechanismcarried thereby.

'In order to em itate the rotation of the screws 35 and 36, Iinayproyidesimple gearing such as is illustrated inFigu re'7, this gearingcomprising a gear 38 which meshes with a pinion 39, the latter beingfixed to a short shaft 40 having a squared end 41to receive tinoperating crank. The gears 38, 39 may be enclosed in -a suitablecasing42to protect them from dust and dirt. 3 Similarly on the frame 23 thecutterghead 27 may be mounted'on a slide 30 which is'longit-udinallymovable as by a raclr 3 1 and an operating wheel 32-, the slide 30 beingsupported by a transverse siide 33 and a standard 34,whi oh arerespectively adjustable as by screws 35 and 36 in the'samem anner ashereinbefore described. Y i

In order to support the worlr securely in proper "position for.o-perat-ipn, I provide withthecutter headsa pair of clamps each of whichis p e ferably adjustable in a plane perpendicular tothe axisitsa'djacent cutter headso as toengageelbows of any diameter within therange of the mechanism. As shown in Figure 2, the frame 22 have fixed atthe forward end thereof suitable standard 43 on which :mounted avertical slide 44, the height of which may be conveniently adjusted by apair of screws 45 which may be'operatedby a ha'nd wheel 46 throughsuitable gearing 47. This vertical slide 44 carries a horizontal slide48 which maybe horizontally adjustedthereen as by ascrew 49 rotatablebya handwheei 5Q. Manipulation o f the hand wheels 46 and5 0thus rnakespossible any desired adjustment oft-he clamp in a planeperpendicular tothe axis ofropera; tion of the cutter head 26.

As shown in Figure 4, the worlrma y be clamped between the top'surfa'ceoft-he slide 44 and the under face of, aclamping memher 51, wh is movale vertically w th espect to the slide 44. In order to effect a quickclamping action, the clamping. member 51 may be carried at the lowerend-ofa stem 52 which is supported by a block 53. The

stem 52 may be provided with a shoulder against which a washer 54 may bepressed as by a spring 55 in such a manner as to press the clampingmember 51 upwardly. In order to moye the ,clamp v 5,1 downwardly toclamping ras -i9 I m y pr dea memh 56 pivoted on a suitable pin 57 andadapted to bear on the upper end of the stem 52. An opera'tingrlever 58may be fixed the clamp block 56 so that when the (block is swung throughan angle of 90 the stem 52 is pushed downwardly thereby for a definitedistance, thus forcing the member 51 downwardly into clamping engagementwith a pipe thereunder.

A similar clamp may be mounted in front f th se t r h a 27- s own i Figs 2 is lam may h a ri d by a standard '75, the pper face of thisstandard ng a t e l we aw of a' amp, f h ch e upper ja s Ope at v a tted n Fi re 4, h s upp r jaw b n an e sely adjustable as by a hand wheel50 which e a es a ew Th tanda d 7 may he v i a y adj s ed s by a v t cals ew h he en Qf hich s mmmte a a le an W el 5 This c ew, eg th rwith esta d may suerhr slon e h qh h y able Slide 77, w ch i tran e y adjust bby a h eeet l sc e .8 supported on the end of the frame 23 The ruh i e othe, c mp n ihhhhah sm may be dentical w th hat ill s r te i Fi 4 anddescribed in detail. I

The block 53 is preferably mounted for ready vertical adjustment inorder to accommodate pipes of difierent diameters. To

this end the slide 48,, which supports the amp, may a e a ti at 59, t ren Qn either side of this slot I provide a serrated surface 60 havingteeth adapted to. engage with similar teeth in the rear face of theblock 53. The block 53 may be clamped in adjusted position againstthe'serrated surface 60 as by a bolt 61 which passes through the slot 59and through-a portionof the block 53. On the head of the bolt 61 ispivotally mounted a pair of ears 610, the edges of which form earnsurfaces which bearoon the rear face of the slide 48. The ears61O mayrotate on a pill 611 extending through the head of the bolt as by ahandle63. V nut 62 on he. Oppos e d f h b lt 61 m y be adjusted so thatmovement of the ears 610 to the position shown in Figure 4 clampstheblock. 53 t gh ly ga n th er a ed ac 60. When the handle 63 is swungupward: ly, the' block :53 is atonce released and may be manually raisedor lowered as desired When the mechanism as a whole isv in the positionillustrated in Figure 1, it is ready to operate on a elbow, the axesQfth Por ion ofxth te he d-s 2 n 27. 9 s a r g t g e It m y be desirabof the mechanism.

however, to trim and shape the ends of ;el-

the mechanism -to operate on elbows with angles of these sizes, the bed20 may be provided with suitably located holes 64 to receive a lockingpin 65 (Figure 3) so as to hold "the frame 23 securely in place when ithas been swung on the pivot 25 to one of the standard angles.

The frame 23 and the mechanism carried thereby may be rotated toadjusted position as by an arcuate rack 650 with which engages.

a suitable pinion 66. As shown in Figure 5, the pinion 66 may be fixedto or formed on the end of a shaft 67 a ratchet wheel'68 being mountedon the upper end-of the shaft 67. Cooperating with the ratchet wheel 68is a pawl 69 which is pressed against the wheel 68 as by a suitablespring 70. A .pin 71 extends through thepawl 69 and projects out fromthe housing'enclosing this portion The pin 71 works in a slot 7 2whereby the pin and pawl may be retracted from the ratchet wheel 68. Thehousing 73 which encloses the ratchet Wheel 68 and in which the pawl 69is mounted is also provided with a recess to receive a suitable handle74 by which the ratchet may be rotated so as to swing the frame 23around its pivot 25. As soon as the pin 650 has reached the desired hole64, the frame 23 may thereupon be locked in position.

The cutter heads 26 and 27 may be each connected to their respectivemotors 28 and 29 by suitable gearing which is capable of automaticallyreversing and stopping. This 0 connecting gearing may be identical forboth cutter heads so that a description of one will serve for both.Referring to Figures 8 and 9, the shaft 79 from the motor rotates apinion 80 which meshes with a gear 81. i This gear is secured to acoaxial pinion 82 and is loosely mounted with it on a shaft 83. Thepinion 82 meshes with a gear 84 loosely mounted on a parallel shaft 85with a coaxial pinion 86 which meshes with a gear 87. A pinion 88 iscoaxial with. and secured to the gear 87, both being loosely mounted onthe shaft 83. The pinion 88 meshes with a gear 89 which is fixed on theshaft 85. Also mounted on the shaft 85 is a gear 90 which meshes with agearof similar size mounted on the shaft 83 so that the train of gearingthus far described operates to drive the shafts 83, 85 at equal speedsin opposite directions. The shaft 85 terminates with the gear 90 andabuts a drive shaft 92 a portion of which-may be squared or splined torotate a clutch member 93 axially slidable thereon. This clutch memberis I adapted to engage a corresponding member on the face of the gear 90so that when these 5 i i 6 members are engaged as shown in Figure 8,

.ing

the shaft 92 is rotated with the shaft 85. A portion of the shaft 83 maybe squared or splined to rotate a clutch member 94 axially slidablethereon. This clutch member is adapted to engage a corresponding memberon the face of a gear 95 which. is loosely mounted. on the shaft 83. Thegear 95 meshes with a pinion 96 which in turn meshes with a gear 97equal in sizeto the gear 95 and mounted on the shaft 92. Thus when theclutch member 94 engages the pinion 95, the shaft 92 is driven in thesame direction as the shaft 83, this being opposite to the direction ofrotation of the shaft 85. Suitable meansmay .be provided for sliding theclutch members 93, 94 into and out of engagement with their respectivegears 90, 95, such operating means including a lever 106 which may berocked. as by a handle 98.

The drive shaft 92 connects the cutter head mechanism with thetransmission gear and is provided with a threaded portion 99 on whichrides a nut 100having a downwardly extend arm 101 which slides on a pairof rods between adjustable abutments 103 and 104. The rods 102 areextensions of a rod which projects from the gear casing. During the reation of the screw 99, the nut 100 travels in one direction. or theother until its arm 101 engages one of the abutments 103, 104accordingto its direction of travel. Thereafter the rod 105 is movedendwise to rock the clutch shifting lever 106. This clutch lever has adownwardly projecting portion 107 which is longitudinally boredtoreceive a plunger 108 behind which is a spring 109. The outer end ofthe plunger may be beveled as shown in Figure 12 and rests against asloping shoulder 110 of acam member 111 which is adjustably secured tothe bottom of the transmission gear casing. .T he inner end of the rod105 is longitudinally bored to receive a plunger 112 behind which is aspring 113.} The spring113 tends to push the plunger 112 out of thebore, the plunger being retained therein as by a suitable pin 114.Opposed to the plunger 112 is a shorter plunger 115 carried in the endof a bridge member 116 and backed by a suitable spring 11'? which tendsto press it in a direction opposite to the plunger 112. As shown inFigures 12 and 13 the plungers 112 and 115 are thus opposed to eachother and press in opposite directions against opposite sides of theextension 107 of the clutch operating lever 106.

If the mechanism has started in operation from the position illustratedin'Figures 9 and 12,.the nut 100 travels toward the right until itreaches the abutment 103 whereupon its further travel pushes the rod 105toward the right. Since the lower end of the plunger 108 rests againstthe cam surface 110, it will be necessary for the plunger 108 to rideupwardly thereon against the pressure of the spring 109 before theclutch operating lever lcexed *to a hollow shaft-123.

106 can be swung from the position shown in Figure 12. On account of theresistance offered by the spring 109 motion of the 1011105 at firstcauses compression of the spring 113 from contact with the opposite sideof the extension 107 so that when the spring 113 is sufficientlycompressed to overcome the re sistance of the spring 109, the plunger108 rides up on the cam shoulder 110, whereupon the motion of theentending' spring 113 snaps the extension 107 toward the right until thelower end of the plunger 108 rests in a depression 118. The swing of thelever 106 from the position shown in Figure 12 to a position wherein theplunger '108 rests in the depression 118 is sufficient to disconnect theclutch and to connect the clutch '97 so that the rotation of the'conn-ecti'ng'shaft 99 is automatically reversed and the nut 1'00 startstraveling toward the left. This travel continues until the'arm 101 ofthe nutengages the abutment 101 so as to'move the rod 105 towardthel'eft. This results in a-compres sion of the spring 117 which isshorter than the spring 113. WVhen the travelof the rod 105 toward theleft is sufiicient to displace the plunger 108 from the depression 118,the plunger is only of sufficient length "to push the extension 107 farenough to the left for the plunger 108 to enter a'seco'nd depression119. l Vhen the plunger rests in this depression, the lever 106 is inits neutral position, that is, neither clutch is engaged, hence thedrive of the cutter head-automatically stops. thismanner, it *is onlynecessary to start the operation of thecutter head on each pipe end tobe trimmed. Once star l ed thus, the cutter head will'travel the'fullextent in one direction, will be automatically reverse-d so as to travelbackto its starting point whereupon the rotation thereof willautomatically stop. g

The cutter heads '26 and "27 are of a type designed to carry a toolaround stationary work, the heads being adj u'stableso F that the toolwill operate on pipes of difier'ent diameters. The cutter head shownini'Figures 14 and 15 is designed for work-on exterior surfaces of pipeends, this cutt'er beingad-apt ed to trim "the outer surface of thepipeend to a suitable taper. Themechanism by'wh ich the tool is carriedis similar in principle to that described in detail in my=co pending=application Serial No. "136,784, "fi led September 21,1926.

The cutting head may he supported on a suitable bracket in which -is-"ournaled-'a suitablegear 121 fixed'tothesha H92. The gear 121 mesheswith a gear 122 which is Gn th'e end of 65 this shaft is fix'ed'atransverse ly extending arm 124 which is longitudinally slotted as at125 to receive a bolt 126 'by which a suitable block 127 may be clampedin-adjustable position on the the arm 124 at theend remote from the slot125 so as to counterbalance to some extent th'e'block 1 27 end the "toolcarriage 129 carried thereby. 'The block 127 is provided with a slot 130in-whiehthe tool carriage 1'29may travel, "the block heing so adjustedthat the slot 130 is inclined with referenceto thedirection of the axisof rotation so that as the tool carriage 129 is fed thereal-ong,the toolcuts a conical-surface on -the end portion-of the work. By loosening thebelt 126, the block 127 with the toolcarri-a gemaybe moved readilyinwardly or outwardlycn the arm 124 to operate on workof differentdiameters.

In order "to f'acilitate the adjustment of the block 127 n'sui'taibleabutment men'rber 131- may bemount-edthereon to engage the end of a rod132 which is'seoured 'atdts further end to'the counterweight1'28.

As shownrin Figure 15, a face ofthe counterwei-g ht may begrooved as anda rack 131 bolted therein. A'hlook 135 having-teeth corresponding toth'e teeth '01 "the rack-134 may be bolted to 'the rack. The teeth ofthe rack l l are preferably-spaced by a nnit distance such as an inch sothat-ea ch adjustment of the h-look on the inac'kim-u'st be 1a wholenumber of inches. Even 's'adjustment off-the rod 1 321ma "hemade:aslbyaflznnnled nut 136 carried int-1e block 51 35vand iinthreaidedengagementwith theulower portion ofthe rod 1%:2,'7th'is:portioniheingsslotted as iaitfi137vand 13111;:5Cl'10 prevent retatironwfthe and in the bloc v :In setting vtheitool rbloclz 127,. iti1na-y befirst moved radially outwardly, thenethe position of the rod unay'be'iadjuste'cl according to the diaineterrof'the' work :to .be operatedupon,"after which thebloc k1127anayibezmovetl inwardly until theabutment 131- engages the end of the rod132. The belt 126im'ay-thereuponbeset np=ti ghtlylto clamp the IblOGk 12.7 in position onthe arnr12 t.ltotartion'of the arm 124rah'ouththeaaxisfiof theworkwvilt carrytherew'i'ththe tool 138; sthi-s to ol being-remova'bly' fixed inaa ssuita ble slide :139 which is ardju sta'b ly l alttached to "a downwardlyprojGCtllTg portion [140 oft-the tool carriage .129.

As ithe-rarm 12 1 swings "the tool carriage 1 29 'a bout theraxis ef theworkgthe carriage maybe fed :along 't'h'e' s'li'de by 'a screw shat-b1 11w itli ufihichtlre carrtage isrin threaded' 'errgagem'entr :The screwshaft 141 is rotated by ia-"su i-tzible train of1'gears f142, =-143, 144and 1 15. -Thei"gears:l42, 143 and 144 are mounted in :a suitable casing:146 which is adaptedtotswvi ngias :a unit around the axis of the 'worktogetlier' with the mm 124. "The gear 'll t5,'lhowever, is fixed againstrotat'ion by being keyed *onotlrer-wise secu-red'to the am 124. Asuitable counter weight 128 may be formed'on orsecured to casing whichforms a part of the bracket 120 so that as the housing 146 revolvesaround the axis, the gear 144 has a planetary motion about thestationary gear 145 and is ro tated thereby, this rotation beingtransmitted to the gear 143 and thence to the gear 142, the feed shaft141 being connected tothe latter. The housing 146 is provided with asuitable slot 147 in its side walls so that when the block 127 is movedradially inwardly or outwardly, the gear 142 is also moved an equalamount by the shaft 141. A pair of suitable plates 148 extend looselyaround the shaft 123 and the bearing shaft of the gear 144 so that thegear 144 is retained in meshing relation with the gear 145 for allpositions of the casing 146. Since the gears 142, 143 and 144 are allournaled in the casing 146, their relative position is thus'maintainedconstant so that the gear 142 is maintained in operative relation forthe gear 145 for all positions of the housing 146. Thus as arm 124carries a cutting tool 128 about the work, this tool may be fed by thefeed shaft 141 which is driven through the gear train as described.

Figures 16 and 17 illustrate a similar cutting head except that the toolcarriage 129 supports a slightly different type of tool holder 149 onwhich is mounted a suitable tool 150 adapted to trim the inner surfaceof the work. Since the taper on the inner surface is opposite from thaton the outer surface, it will be observed that the angle of travel ofthe carriage shown in Figure 17 is different from that of the carriageshown in Figure 15. The mounting of the tool carriage on the arm, themeans for adjusting the tool carriage radially, and means for feedingthe tool carriage along the work may be all identical with thosedescribed hereinbefore in connection with the cutter head illustrated inFigures 14 and 15.

In operating on an elbow, the frame 23 may first be fixed at the desiredangle with reference to the frame 22, a right angle being shown inFigure 1. The standards supporting the cutter heads and their drivingmechanisms may then be suitably adjusted so as to be properly spacedfrom one another. The

work holding clamps may then be adjusted if necessary so that thecenters of the ends of the Work will be suitably alined wit-h the axisof rotation of the tool. In order tocenter the cutting heads to the endsof the work, each cutting head may be backed off by manipulation of thehand wheel 32. If the cutter head is for operation on the outer surfaceof the work, as in Figure 15, a centering cone 151 may be mounted on theforward face of the arm 24, this cone being held in place as by a stem152 which enters the open end of the hollow shaft 123. The hand wheel 32may then be turned to advance the cutter head until the end of the cone151 enters the work and properly centers it. Thereupon the variavs adjstable parts at the mechanism are suitably adjusted sothatthe cutterheads are properly alined with their respective clamps. The cutter headsmay then be backed ofi topermit the removal of the centering cones,whereupon theheads are again advanced to operative position.

If the cutter head isdesigned for operation on the inner surface of thework, a centering cone 153 may be mounted in such a way as not tointerfere with the tool holder 149. As shown in Figure 17 the cone 153may be supplied with an offset stem 154 adapted to slip into a recess ina boss 155 formed on the counterweight 128.

Having thus described an embodiment of this invention, it should beevident to those skilled in the art that various changes andmodifications might be made therein without departing from its spirit orscope as defined by the appended claims.

I claim:

1. Apparatus of the class described comprising a pair of cutter headsfor trimming the ends of a pipe elbow, means for revolving each cutterhead around an axis, means for supporting the cutter heads with theiraxes intersecting, means for clamping a pipe elbow from above and belowat points adjacent to the ends thereof, each clamp being vertically,

adjustable relatively toits respective cutter head.

2. Apparatus of the class described comprising a horizontal bed, avertical pivot thereon, means for supporting a pipe elbow with itscurvature approximately concentric with the axis of said pivot, a cutterhead mounted for operation on one end of an e1- bow thus supported, anda second cutter head swingable about said pivot and mounted foroperation on the other end of said elbow.

3. Apparatus of the class described comprising a. horizontal bed, avertical pivot, a pair of frames adjustable with respect to each otherabout said pivot, a cutter head on each said frame revoluble about ahorizontal with its ends aligned respectively with the aXes ofrevolution of said cutter head.

4. Apparatus of the class described comprising a horizontal bed, avertical pivot thereon, a frame fixed to said bed, a cutter head mountedon said frame revoluble about an axis perpendicular to a radius fromsaid pivot, means for adjustably moving said cutter head along its axisand horizontally at right angles thereto, an arm extending horizontallyfrom said pivot and swingable thereon, and a second cutter head carriedby. i

said arm.

5. Apparatus of the class described comprising a horizontal bed, avertical pivot thereon, a frame fixed to said bed, a cutter head mountedon said frame and revoluble reheat a han out-a1- a is an. a m twi geleabout said pivot, said arm being parallel to but Qfiset f om a rad us fthe P a 1 1 second frame and cutter head carried by seidl arm, saidsecond cutter head being revoluble about a horizontal axis perpendicularto said radius,

In testimony whereof I have aflixed my signature.

HOWARD .PARKEB--

